The Arc'teryx Sphinx Halfshell Jacket is Sphinx Halfshell Patterned is a technical combat top for wear under armor or on its own as a midweight piece. Tweave® four-way stretch woven fabric in two different weights optimizes their differing thermal properties to best suit an active operative’s need for breathable, low profile garments. Comfortable next to skin, the Sphinx Halfshell™ can also be layered over a base shirt, yet is slim and long enough to tuck inside combat pants. Designed with motion in mind, the articulated arms move unrestricted and sleeves roll up and stow for a short-sleeve option. High mandarin collar seals out drafts and other intrusions; zippered bicep pockets keep small items secure.